一，添加顶级菜单：
添加方法：
add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position );
- $page_title：(字符串) (必须) 这个参数是子菜单的标题，将会显示在浏览器的标题栏，默认为空；
- $menu_title：(字符串) (必须) 显示的菜单名称，默认为空；
- $capability：(字符串) (必须) 用户权限，定义了具有哪些权限的用户会看到这个子菜单（权限部分请看文章结尾处），默认为空，参照capability；
- $menu_slug：(字符串) (必须) 显示在URl上面的菜单名称，默认为空；
- $function：返回的方法名称；
- $icon_url：(字符串) (可选) 显示的菜单图标，可以使用plugin_dir_url( __FILE__ )，图标宽高为16像素；
- $position：(整数) (可选) 显示菜单的位置。常用位置，4或者59或者99。
例子：
在模板的functions.php添加以下代码：
function add_advertise_pages() {
$icon_url=’http://www.luckybird.me/wp-content/uploads/2015/09/443e2d96c5201124216c443c4ec48716.jpg’;
add_menu_page(‘Advertise’, ‘Advertise’, ‘administrator’, ‘advertise’, ‘advertise_toplevel_page’,$icon_url,50);
}
function advertise_toplevel_page() {
echo ‘advertise’;
}
add_action(‘admin_menu’, ‘add_advertise_pages’);
2，添加子菜单
方法：
add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function );
$parent_slug
这个参数为WordPress内置菜单的文件名称或缩略名，这里我们通常采用菜单文件名的方式。传递这个参数，就说明要往这个顶级菜单添加子菜 单，以上示例代码中传递的值为 tools.php ，对应工具顶级菜单，下面提供这个参数的所有值及其对应的顶级菜单：
- index.php：控制板
- edit.php：文章
- upload.php：媒体
- link-manager.php：链接
- edit.php?post_type=page：页面
- edit-comments.php：评论
- themes.php：主题
- plugins.php：插件
- users.php：用户
- tools.php：工具
- options-general.php：设置
$page_title
这个参数是子菜单的标题，将会显示在浏览器的标题栏。
$menu_title
这个是子菜单的名称，将会显示在侧边栏
$capability
用户权限，这个定义了具有哪些权限的用户会看到这个子菜单，具体的参数值，可以参考上面第一部分的顶级菜单的说明。
$menu_slug
子菜单的缩略名，请使用一个唯一的名称，英文形式。
$function
所有调用的函数名称，通过调用这个函数来显示这个子菜单页面的内容
例子：
function add_advertise_qr_submenu() {
add_submenu_page( ‘advertise’, ‘QR’, ‘All QR’, ‘administrator’, ‘advertise-QR’, ‘advertise_qr_submenu’);
}
function advertise_qr_submenu() {
echo ‘All QR’;
}
add_action(‘admin_menu’, ‘add_advertise_qr_submenu’);
3，效果图
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